US4422718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Submarine optical fiber cable
Assignee: KDDI Corp
•
Filing: 1981-11-03
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Granted: 1983-12-27
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Expires: 2001-11-03
Abstract
Abstract A submarine optical fiber cable using a low-loss optical fiber as a transmission medium, which is provided with a cylindrical pressure resisting layer composed of an assembly of three equally divided long pressure resisting segments of fan-shaped sections with flat contact planes and having at least one optical fiber in an optical fiber housing space formed in the center of the assembly so as to protect the optical fiber from a high water pressure.
Inventors
- 👤 Yukio Nakagome
- 👤 Kitsutaro Amano
- 👤 Taiichiro Nakai
- 👤 Yasuhiko Niiro
- 👤 Yoshihiro Ejiri
- 👤 Hitoshi Yamamoto
- 👤 Yoshihiko Yamazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:32
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/44; G02B6/4401; G02B6/4407; G02B6/4415; G02B6/4427
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
115 words
A submarine optical fiber cable using a low-loss optical fiber as a transmission medium comprising a cylindrical pressure-resisting metal layer consisting of an assembly of only three longitudinally extending nonstranded pressure-resisting segments, each of said segments being fan-shaped in cross section and all equal in cross section with entirely flat contact surfaces along which the segments make contact longitudinally and solid throughout, said segments converging toward a center and defining one cylindrical optical fiber housing space centrally of the assembly, and at least one low-loss optical fiber extending longitudinally in the optical fiber housing space formed in the center of the assembly so the low-loss optical fiber is protected from a high hydrostatic water pressure.
Claim 2
Dependent Claim
115 words
A submarine optical fiber cable using a low-loss optical fiber as a transmission medium comprising a cylindrical pressure-resisting metal layer consisting of an assembly of only three longitudinally extending nonstranded pressure-resisting segments, each of said segments being fan-shaped in cross section and all equal in cross section with entirely flat contact surfaces along which the segments make contact longitudinally and solid throughout, said segments converging toward a center and defining one cylindrical optical fiber housing space centrally of the assembly, and at least one low-loss optical fiber extending longitudinally in the optical fiber housing space formed in the center of the assembly so the low-loss optical fiber is protected from a high hydrostatic water pressure.
Claim 3
Dependent Claim
27 words
A submarine optical fiber cable according to claim 1, wherein the pressure resisting segments are assembled by welding or bonding them together into said pressure resisting layer.
Claim 4
Dependent Claim
28 words
A submarine optical fiber cable according to claim 1, wherein the pressure resisting segments are assembled together by wrapping a tape around them into said pressure resisting layer.
Claim 5
Dependent Claim
30 words
A submarine optical fiber cable according to claim 1, wherein the pressure resisting layer is made of a good conductor of electricity and used for feeding electric power to separators.
Claim 6
Dependent Claim
34 words
A submarine optical fiber cable according to claim 1, wherein the pressure resisting layer is made of a material having a large tensile strength and adapted to have the function of a tension member.
Claim 7
Dependent Claim
45 words
A submarine optical fiber cable according to claim 1, wherein partition members are provided in the optical fiber housing space at suitable intervals in the lengthwise direction of the pressure resisting layer to prevent movement of a fluid in the space in the lengthwise direction.
Claim 8
Dependent Claim
19 words
A submarine optical fiber cable according to claim 6, wherein the partition members are each formed of an adhesive.
Claim 9
Dependent Claim
43 words
A submarine optical fiber cable according to claim 6, wherin the optical fiber housing space is filled with a liquid or jellied substance for preventing sea water from entering into the space and increasing the pressure resisting strength of the pressure resisting layer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-26 | 1987-06-27 | 1987-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-26 | 1991-06-27 | 1991-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-26 | 1995-06-27 | 1995-12-27 | $7700.00 | Window Closed / Lapsed |